34 
New Zealand Ferns 
{S') H. atrovirens (blackish-green). Smaller than 
H. australe, from which it differs chiefly in the nar- 
rower and more sparingly divided frond, and in the 
wings of the stalk and midrib being flat, not crinkled. 
Description . — Usually terrestrial. Root slender, wiry, creep- 
ing. Stalks about half the length of the frond, winged almost to 
the base. Fronds few, somewhat rigidly erect, membranous, dull 
dark-green, 2 to 6 inches long by ^in. to 1 inch broad. Seeds few, 
terminating the leaflets. 
A rare fern. Auckland — Bay of Islands, Whangarei, Mamaku 
near Rotorua, Lake Waikaremoana. South Island: Wakatipu. 
Sea-level to 2,500 feet. 
Apparently confined to New Zealand. 
